|  | 6.1 | Access Control Lists (ACLs)
| 6.1.3 | Testing packets with ACLs
The order in which you place ACL statements is important. When the router is deciding whether to forward or block a packet, the Cisco Internetwork Operating System (IOS) software tests the packet against each condition statement, in the order in which the statements were created. Note: After a match is found, no more condition statements are checked. If you create a condition statement that permits all traffic, no statements added later will ever be checked. If you need additional statements, in a standard or extended ACL you must delete the ACL and re-create it with the new condition statements. This is why it's a good idea to edit a router configuration on a PC using a text editor, and then send it to the router using TFTP (Trivial File Transfer Protocol). You can create an ACL for each protocol you want to filter for each router interface. For some protocols, you create one ACL to filter inbound traffic, and one ACL to filter outbound traffic.
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